SELECTOR SWITCH INTERPRETATION Dodge Pickup R1500

SELECTOR SWITCH INTERPRETATION

SELECTOR SWITCH INTERPRETATION

For resistances between the ranges B-E shown for each valid position (T-Case NEUTRAL, 4LO, 4HI, AWD), the TCCM may interpret the resistance as

1. either of the neighboring valid positions.
2. as an invalid fault position.

For resistances between the ranges E and F shown for AWD and in-between positions, the TCCM may interpret the resistance as

1. the AWD position.
2. an invalid fault position.
3. a valid in-between position.

For resistances between the ranges F and G shown for in-between positions and fault condition (open), the TCCM may interpret the resistance as

1. a valid in-between position.
2. an invalid fault position.

For resistances between the ranges A and B shown for the fault condition (short) and T-Case NEUTRAL, the TCCM may interpret the resistance as

1. the T-Case NEUTRAL position.
2. an invalid fault position.

The LED's in the selector assembly are illuminated/flashed in the following manner to indicate a particular condition or state.

1. A solidly illuminated LED indicates a successfully completed shift and the current operating mode of the transfer case. While a shift has been requested but not yet completed, the LED for the desired transfer case position is flashed.
2. A flashing operating mode LED for the desired gear indicates that a shift to that position has been requested, but all of the driver controllable conditions have not been met. This is in an attempt to notify the driver that the transmission needs to be put into NEUTRAL, the vehicle speed is too great, or some other condition outlined (other than a diagnostic failure that would prevent this shift) elsewhere (Refer to «OPERATION»(/dodge/pickup-r1500/1997-2012/remont/body-cab-control-systems/#electronic-control-modules) ) is not met. Note that this flashing will continue indefinitely until the conditions are eventually met, or the selector switch position is changed, or if diagnostic routines no longer allow the requested shift.
3. If the driver attempts to make a shift into transfer case NEUTRAL, and any of the driver controllable conditions are not met, the request will be ignored until all of the conditions are met or until the NEUTRAL select button is released. Additionally the neutral lamp will flash, or begin to flash while the button is depressed and operator controllable conditions are not being met. All of the LED's except the Neutral will flash if any of the operator controllable conditions for shifting are not met while the Neutral button is depressed. This "toggle" type of feature is necessary because the TCCM would interpret another request immediately after the shift into transfer case NEUTRAL has completed.
4. No LED's illuminated indicate a fault in the transfer case control system.

The shift motor (Scheme 405) consists of a permanent magnet D.C. motor with gear reduction to convert a high speed-low torque device into a low speed-high torque device. The output of the device is coupled to a shaft which internally moves the mode and range forks that change the transfer case operating ranges. The motor is rated at 25 amps maximum at 72° F with 10 volts at the motor leads.

Scheme 405

The transfer case shift motor responds to the Transfer Case Control Module (TCCM) commands to move the transfer case shift sector bi-directionally, as required, to obtain the transfer case operating mode indicated by the instrument panel mounted selector switch.

Note. New shift motor assemblies are shipped in the 2WD/AWD position. If a new shift motor assembly will be installed, it will be necessary to shift the transfer case to the 2WD/AWD position prior to motor removal.

1. Raise the vehicle on a suitable hoist.
2. Disengage the wiring connectors from the shift motor and mode sensor.
3. Remove the bolts holding the shift motor and mode sensor assembly onto the transfer case.
4. Separate the shift motor and mode sensor assembly from the transfer case.

1. Verify that the shift sector o-ring is clean and properly positioned over the shift sector and against the transfer case. NOTE: Verify that the shift motor position and sector shaft orientation are aligned. It may be necessary to manually shift the transfer case if the shift motor and sector shaft are not aligned.
2. Position the shift motor and mode sensor assembly onto the transfer case.
3. Install the bolts to hold the assembly onto the transfer case. Tighten the bolts to 16-24 N.m (12-18 ft. lbs.). CAUTION: If the original shift motor and mode sensor assembly bolts are reused, be sure to use Mopar(R) Lock & Seal or Loctite(tm) 242 to replenish the lock patch material originally found on the bolts.
4. Engage the wiring connectors to the shift motor and mode sensor.
5. Refill the transfer case as necessary.
6. Lower vehicle and verify transfer case operation.

See also:
• PROPELLER SHAFT
• EXHAUST SYSTEM
• OPERATION
• STANDARD PROCEDURE - FLUID DRAIN AND REFILL
• SECTOR ANGLES VS. TRANSFER CASE POSITION
• MODE SENSOR CHANNEL STATES